1. A large box is raise to a vertical height o f8 m, when the energy spent is 64,000 J . Calculate the mass of the box. (Take g = m/s^2 )

h=8m
energy=64000
g=10m/s2
m=?

As we know, E=W.
Then,
W= m.g.h
64000= m.10.8
64000/8.10=m
64000/80=m
800kg=m

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